The signal context of certain RISC-V extensions will be appended after
struct __riscv_extra_ext_header, which already includes an empty context
header. Therefore, there is no need to preserve a separate hdr for the
END of signal context.

Fixes: 8ee0b41898fa ("riscv: signal: Add sigcontext save/restore for vector")
Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com>
Reviewed-by: Zong Li <zong.li@sifive.com>
---
 arch/riscv/kernel/signal.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index dcd282419456..c3c517b9eee5 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -215,12 +215,6 @@ static size_t get_rt_frame_size(bool cal_all)
 		if (cal_all || riscv_v_vstate_query(task_pt_regs(current)))
 			total_context_size += riscv_v_sc_size;
 	}
-	/*
-	 * Preserved a __riscv_ctx_hdr for END signal context header if an
-	 * extension uses __riscv_extra_ext_header
-	 */
-	if (total_context_size)
-		total_context_size += sizeof(struct __riscv_ctx_hdr);
 
 	frame_size += total_context_size;
 
-- 
2.17.1

Hi Young-Xuan,

Yong-Xuan Wang <yongxuan.wang@sifive.com> 於 2024年12月10日 週二 下午10:24寫道：
>
> The signal context of certain RISC-V extensions will be appended after
> struct __riscv_extra_ext_header, which already includes an empty context
> header. Therefore, there is no need to preserve a separate hdr for the
> END of signal context.
>
> Fixes: 8ee0b41898fa ("riscv: signal: Add sigcontext save/restore for vector")
> Signed-off-by: Yong-Xuan Wang <yongxuan.wang@sifive.com>
> Reviewed-by: Zong Li <zong.li@sifive.com>
> ---
>  arch/riscv/kernel/signal.c | 6 ------
>  1 file changed, 6 deletions(-)
>
> diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
> index dcd282419456..c3c517b9eee5 100644
> --- a/arch/riscv/kernel/signal.c
> +++ b/arch/riscv/kernel/signal.c
> @@ -215,12 +215,6 @@ static size_t get_rt_frame_size(bool cal_all)
>                 if (cal_all || riscv_v_vstate_query(task_pt_regs(current)))
>                         total_context_size += riscv_v_sc_size;
>         }
> -       /*
> -        * Preserved a __riscv_ctx_hdr for END signal context header if an
> -        * extension uses __riscv_extra_ext_header
> -        */
> -       if (total_context_size)
> -               total_context_size += sizeof(struct __riscv_ctx_hdr);
>
>         frame_size += total_context_size;
>
> --
> 2.17.1
>

Thanks for the findings

Reviewed-by: Andy Chiu <AndybnAC@gmail.com>